JEE · NEET Previous Year Question
Substance A has atomic mass number 16 and half life of 1 day. Another substance B has atomic mass number 32 and half life of day. If both A and B simultaneously start undergo radio activity at the same time with initial mass 320 g each, how many total atoms of A and B combined would be left after 2 days.
Topic: JEE PYQ
Answer: A. Full step-by-step solution below.
- A3.38 x
- B6.76 x
- C6.76 x
- D1.69 x
Correct answer: A
Solution
(a) (N0)A = = 20 moles(N0)B = =10 moles
Total N = 5.625
No. of atoms = 5.625 x 6.023 x 1023 = 3.38 x 1024
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